/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.ignite.internal.tostring;

import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Map;

/** Returns only the size of a {@link Collection}, {@link Map}, or array. */
public class SizeOnlyStringifier implements Stringifier<Object> {
    @Override
    public String toString(Object instance) {
        if (instance instanceof Collection) {
            return Integer.toString(((Collection<?>) instance).size());
        } else if (instance instanceof Map) {
            return Integer.toString(((Map<?, ?>) instance).size());
        } else if (instance.getClass().isArray()) {
            return Integer.toString(Array.getLength(instance));
        }

        throw new IllegalArgumentException("Unsupported type: " + instance);
    }
}
